Hallmarks are the key to unlocking the age, origin, purity, and story behind your precious metal jewellery...
Hallmarks are one of the most reliable ways to identify genuine gold, silver, platinum, and palladium in the UK. They tell you where an item was tested, what it’s made of, and often when it was created—making them essential for collectors and buyers of antique or vintage jewellery.
What Is a Hallmark?
A hallmark is an official stamp applied by a UK Assay Office after testing an item to confirm its metal purity. This independent verification protects buyers and ensures that precious metal items are genuinely what they claim to be.
The Four UK Assay Offices
Every UK hallmark includes a symbol identifying which Assay Office tested the item:
- London – The Leopard’s Head
- Birmingham – The Anchor
- Sheffield – The Rose (formerly the Crown)
- Edinburgh – The Castle
These essential symbols instantly reveal where the piece passed assay testing, and they help collectors trace a jewellery item’s history.
Metal Purity Marks
A hallmark always includes a fineness mark showing the precious metal content:
- Gold: 375, 585, 750, 916, 999
- Silver: 800, 925, 958, 999
- Platinum: 850, 900, 950, 999
- Palladium: 500, 950
This number is one of the most important parts of the hallmark, confirming the true purity of the metal.
Date Letters
Many UK hallmarks include a letter identifying the year the item was assayed. The font, style, and shape of the letter vary each year, helping experts date jewellery very accurately—especially Georgian, Victorian, and early 20th-century pieces.
Why Hallmarks Matter
Whether you’re collecting, selling, or simply enjoying your jewellery, hallmarks provide clarity, assurance, and history. Knowing how to read them helps you understand exactly what you own—and ensures you’re getting fair value when buying or selling precious metals.
Old English Hallmarks & 15-Carat Gold
Fifteen-carat gold (15ct / 625) was produced mainly between 1854–1932 and appears on many Victorian
and early Edwardian pieces. Marked as “15”, “15ct” or sometimes as “625”, it contains
62.5% pure gold. Because 15ct is no longer produced, genuine pieces are sought after and often more desirable
than later lower-carat jewellery. A small hallmark—yet one that adds both history and value.